im jacking this from the NICO forums.... as far as i know this gentleman isnt on here? so i just wanted to share this awesome nugget.
I added a second radiator to my S13 to fix cooling issues. : 240sx General Discussion
basically, he's running an LS motor & although he has an upgraded radiator, is still having issues w/ heat. so he takes the a heater core and motorcycle fanto create a secondary radiator!! this would be a less expensive option for those who didnt have enough $ to upgrade their current radiator.